miércoles, julio 02, 2003
[ 154. More Exams ]
" Experiment 1:
Using the copper wire given, twist it around the given pencil, leaving about 5 cm on one end and 10 cm on the other. Attached the 5 cm end to the retort stand, and twist the 10cm end around the centre of the pencil to suspend it. Attach the 20g masses to a point 5cm from the centre of the pencil on each side. Perform the oscillation as shown.
Experiment 2:
Set up the circuit as shown, and record the relevant variables. "
Damn duh right?
The first one was irritating.... the pencil will either slip to the left or the right.
Then can't even oscillate properly, from horizontal oscillation become round ones.
But thank God lo... cause i couldn't finish the first report by the end of the first hour,
but the second experiment was so quickly done that after catching up on my first report,
i had time to catch up with my sleep. =)
Fmaths:
" An experiment has been performed to compare the yields of a new variety of fruit trees with the old variety. The trees were planted in eight regions with varying climatic conditions in the following manner. Two trees were planted in each region, one of the new variety and one of the old variety. The yields of the fruit trees are given in the table below.
Region 1 2 3 4 5 6 7 8
Old variety (x) 195 193 192 195 200 190 188 196
New variety (y) 203 191 195 193 208 196 196 203
Determine a symmetric 99% confidence interval for the mean difference in the yields of the two varieties of fruit trees, stating any assumption(s) you have made. [5]
Suppose the sixteen trees were not planted as stated above but had been randomly planted in an orchard. Using the summary statistics,
∑(x-190)=29 , ∑(x-190)²=203 , ∑y=1585 , ∑y²=314269
determine a symmetric 99% confidence interval for the difference in the mean yields of the two varieties of fruit trees. State any assumption(s) you have made. [6]"
And this is my answer: ???
But alas, i thank God!
I only studied for mechanics during my quarantine period after the physics practical
(yes, i didn't hit the books yesterday for mechanics)...
and i could do ALL the mechanics questions!!!! Hallelujah!!!! =p
Shannon left at 6:11 p. m..
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